Sound-propagating diaphragm



June 24, 1930. J. P. GATY 1,768,473

scum) PROFAGATING DIAPHRAGM Filed May 2, 1928 fig. 1

TUNER DE E TOR AMPLIFIER /4 ATTORNEYS- Patented June 24, 1930 PATENT OFFICE JOHN POMEROY GATY, OF MADISON, NEW JERSEY SOUND-PROPAGATING DIAPHRAGM Application filed May 2, 1928. Serial No. 274,598.

The invention relates to means for actuating sound propagating diaphragms.

One object of the invention is to provide improved means for attaching an actuating arm to a sound propagating diaphragm of a laminated or composite type.

Further objects of the invention are to provide means for the attachment of an actuating arm to a composite sound propagating diaphragm whereby the energy for vibrating the diaphragm will be applied internally of the diaphragm.

A still further object of the invention is to provide means within a sound propagating diaphragm for cooperation with an actuating arm to retard the movement of the faces of the diaphragm with respect to the actuatlIlg arm.

One feature of the invention relates to the securing of an actuating arm to an attaching plate positioned internally of a composite sound propagating diaphragm.

Another feature of the invention relates to the provision of air Cells between point of attachment of an actuating arm and the surfaces of a sound propagating diaphragm whereby a dampening of the vibration is effected.

Other objects and features will appear from the following description in connection with the accompanying drawings in which Figure 1 of the drawings is a sectional view of a sound propagating apparatus embodying the present invention.

Figure? is a detail View of the present invention shown in section.

Like reference characters denote like parts in the several figures of the drawing.

In the following description and claims, parts, characteristic features and functions will be identified by specific means for convenience of expression, but they are intended to be as generic in their application to similar parts or equivalent construction as the art will permit.

Referring to the drawings, for supporting a sound propagating diaphragm a base 10 is provided carrying a supporting rim 11 to which the diaphragm is secured by a retaining rim 12.- A supporting arm 13 is also provided secured to the rim 11 for supporting electromagnetic unit 14 to which is secured an actuating arm 15 for imparting vibration to the sound propagating diaphragm.

For controlling the electromagnetic unit 14 in accordance with a signal wave, there is provided an energy responsive device 20, shown in the form of an antenna positioned to intercept radiant energy or so-callcd Hertzian waves. It is understood that such waves may be emitted from a radio broadcast station of a conventional type, but as the emission of such energy forms no part of the present invention, it is thought thata detailed description thereof may be omitted herein. The emitted energy preferably takes the form of a carrier wave of high frequency modulated in accordance with a signal current, the signal current corresponding in wave form to sound waves. The antenna 20 at the receiving station is operatively connected to a tuner 21. a ground or coui'iterpoise 22 being provided therefor. The tuner 21 may be variably adj ustcd so as to tune the circuits 20, 22 to the frequency of the carrier wave which it is desired to receive and connection comprising a pair of wires 23-23 extends from the tuner 21 to a detector 24 for impressing thereon electrical waves of this predetermined frequency. The detector 24 may be of any usual form for detecting high frequency energy and producing therefrom rectified or detected waves of signal frequency. These signal waves are transmitted over a pair of conductors 25 extending to the input of an amplifier 26 whereby the signal energy is amplified to a desired degree. A pair of conductors 27 forms an operative connection from the output of the amplifier 26 to the electromagnetic unit 14. Thus undulatory current of signal frequency is impressed upon the electromagnetic unit 14 under control of received radiant energy.

For propagating sound waves a composite diaphragm 30 is provided preferably formed of a plurality of sheets of fibrous material such as paper or the like including a central sheet 31 and a pair of external facing sheets 32 and 33 respectively, spaced from phrao'ms r ."ihration to the sound diaplnz. at attaehment l is prelim" V aired to one tare of sl by g uing or the lilie.

is an aetuimpnlses from e imparted to ch in turn im he fa ing sheets we 'faein SlKOl'S age oi t the det movement taro-n n V '1 c4- anu sheets i; and

For operatn'el roonerting the a tuating ('lutrh =l eomprising an e i ru aha'ped memaz-iuating arm l a q I .r-y r mternallv (muting with the we he nnnnber L \vherelni farm is positioniiwl within tin nl ot the internalii' the side ta es to securely engage the be seen, that the invention means at actuating a sound aphragm o"? the composite tions impartml by an e Til)? be damned l re (ans Fan-frees of the diaion upon which this applica- 's broad r th n the specific emd for the pure least some of the i be employed. The tie invent on is therefore to be I hit lZ-eing limited by the pres "on. I intend no limitaseope o t ating unit to a point between the faces of said diaphragm.

1.. Means for propagating sound waves from a sound propagating (liaphragm haw ng substantial tllh'lfINSS comprising an attaehing' plate positioned within said dia phragm and an aruating arm secured to said attaching plate and means for conneeting said aetur'lting arm to an :mtuating unit.

3. I 1 combination with the sound propagating diaphragm having substantial thickan attaching plate positioned internally ot sail diaphragm, an actuating arm attached to said attaching plate and means for imparting vib'ation to said actuating arm.

t. Means for propagating sound waves 'rom a Composite sound propagating diarzigm tog-med ot a plurality of sheets eomusing an attarhing plate secured between ce sluetr: a; said diaphragm and an actuat- ,3 arm eonneeted to said attaching plate.

5. A sound propagating diaphragm com prising a central sheet. deformed spacing members p1 sitioned on either side of .aid sheet, and ii. *ing sheets forming the outer snrfaee of said diaphragm attached to said deformed sheets and means for attaching an actuating arm to said central sheet.

(3. Means for dampening the vibrations of a sound propagating diaphragm with res wet to the Yibrations ot an actuating means rompr ig a plurality of air cushioning mom: between the ares of said diaphragm "-l. :m atta-rrhiug plate positioned between cushioning means.

,gr -d at Xew York. in the county of lien' York and State of New York, this iiih day ot January, A. l). 1928.

JOHN POMEROY GATY. 

